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Stripe Rust in Winter Wheat Spotted in ID and WA

May 31, 2019

Stripe rust has started to appear in winter wheat in ID, with lesions appearing on leaf tips in the upper canopy. While neighboring state WA is facing low stripe rust pressure, predictions see it developing quickly in the next 2 weeks. With prime weather conditions in the Pacific Northwest anticipated for rapid disease spread, now is the time to switch your focus to protecting your winter and spring wheat crops from this disease pathogen.

To identify stripe rust, look for yellow spore masses growing as long stripes on leaves, occasionally growing onto the stems and heads. As wheat matures, black spores form in stripes and are covered by the lead epidermis.

If you suspect stripe rust is infecting your fields, monitor how widespread the disease is and the weather forecast. Keep in mind, stripe rust’s survival requires sustained temperatures between 50º F and 60º F, with intermittent rain or dew to develop. Irrigated fields are at higher risk.

Field scouting aids in detecting stripe rust early, and the disease can be managed through fungicide applications. We have several fungicide options to fit a variety of needs:

For fields with low disease pressure or where the need for long-lasting residual control is not anticipated:

  • Tilt® fungicide is absorbed into the plant quickly and moves within it to provide some curative control of infections and protect crops for a short time after application. It is a Group 3 fungicide and contains a single active ingredient.

For fields anticipating moderate disease pressure, in irrigated or dryland wheat with a thick canopy and high yield potential, or when conditions are conducive to rapid disease development:

  • Quilt Xcel® fungicide will deliver curative and preventive control. A combination of Group 3 and Group 11 active ingredients, Quilt Xcel combines the active ingredient in Tilt with an ingredient that moves slowly into and within the leaf to provide extended rust control. 

For fields anticipating moderate to heavy disease pressure, with planted varieties highly susceptible to rust, in irrigated or dryland wheat with a thick canopy and high potential, when conditions are conducive to rapid disease development, or when there is an anticipated need for extended rust protection:

  • Trivapro® fungicide combines 3 robust active ingredients from Group 3, Group 7 and Group 11 fungicides to deliver the longest-lasting rust control while offering plant-health benefits. Its curative activity stops existing disease and protects against future infections significantly longer than Quilt Xcel. Trivapro provides longer disease protection and healthier and greener plants, resulting in improved yield potential.

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